Self-rolling "snow bales" seen in Idaho
![The rare formations require the right combination of temperature, terrain, wind and snow. [CRI]](http://images.china.cn/attachement/jpg/site1007/20090420/000bcdb95f1d0b562ce760.jpg "The rare formations require the right combination of temperature, terrain, wind and snow. [CRI]") |
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The rare formations require the right combination of temperature, terrain, wind and snow. [CRI] |
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